Sitepoint has unveiled its JavaScript reference, written by James Edwards. It's an ambitious undertaking, containing many extra useful notes and tips, and I'm very glad that my Tables now finally have some company.

Now that I think about it, this reference was originally supposed to be a book, and I edited a first draft about a year ago. I was wondering what happened to the book, and now I know.

Congratulations, Sitepoint and James. Excellent addition to the world of JavaScript references.

Opera has done something cool again: it has unveiled a search engine called MAMA.

Opera Mama. I must admit that the first association going through my head was one of overweight Italian sopranos singing arias while cooking pasta for their large brood of children, but that does not seem to be what the project is about.

The Opera Mama search engine doesn't search for content, but for structure. In other words, it answers questions like how many websites use headers at all, and of those, how many use them correctly?

Now that's pretty interesting by itself.

Even better is the excellent series of articles that describes what Opera Mama does, why it does exactly what it does, and not something else, and a literature list with previous attempts to study web site structures. This is what a good article series should look like. If we'd all follow Opera's example, writing about web development would become ever so slightly more scientific.

Dedicated to providing solid information, documentation, and community for Mozilla and Firefox developers. Looks like an interesting initiative, and as far as I can see now the JavaScript and DOM pages might eventually take the place of the alas disappeared devedge JavaScript reference.

Interesting series of compatibility tables for HTML, CSS and JavaScript in Explorer Windows, Mozilla and Opera. I think my W3C DOM Tables are more useful and detailed, but the tables here are definitely more complete.